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PJL · 12th Jul 2019, 7:45 pm

Don't use it like this as it sounds like one valve is not conducting.

How did you test the cathode current as both cathodes share the same bias resistor?

Can you also check continuity of the output transformer primary. Not sure if the transformer is the Ultra-Linear (5 connections) or standard (3 connections)?

12th Jul 2019, 7:45 pm	#41
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Voltages on ECC83 in BlackBox Don't use it like this as it sounds like one valve is not conducting. How did you test the cathode current as both cathodes share the same bias resistor? Can you also check continuity of the output transformer primary. Not sure if the transformer is the Ultra-Linear (5 connections) or standard (3 connections)?